ECOSYSTEM/FOODCHAIN

In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?

• 80%
• 90%
• 10%
• 20%

The arrows in a food chain or web represents what?

• They point to the organism that is being eaten.
• It shows how sunlight flows within an ecosystem.
• They show what direction the energy is flowing between organisms. 
• They represent how water is transferred within a habitat.

An organism that gets energy from breaking down dead organisms, non-living material or waste is a(an) ___________.

• producer
• consumer
• decomposer
• autotroph

The efficiency of energy transfer from a lower trophic level to the next highest level is roughly

• 1%
• 10%
• 100%
• 1000%

Trophic levels are represented by 

• squares
• circles
• pyramids
• lines

If the hawk population decreases, what will happen to the snakes and rabbits?

• Snakes and rabbits will increase

• Snakes and rabbits will decrease

• Snakes will decrease, rabbits will increase

• Snakes will increase, rabbits will decrease

What will happen if the snake population is DOUBLED?

• The other populations will increase too

• The other populations will decrease

• Rabbits and hawks will decrease, grass will increase

• Grass and hawks will increase, rabbits will decrease

The grass is on which trophic level?

• 1st

• 2nd

• 3rd

• 4th

The snake is what type of consumer?

• Primary

• Secondary

• Tertiary

Which of the following are the products of decomposition?

• Food and water

• Carbon dioxide, mineral salts and digested food

• Oxygen, carbon dioxide and bones

• Carbon dioxide, water and mineral salts